(unnamed)

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(unnamed) flows into River Usk , which it joins at N 51° 57′ 1″, W 3° 30′ 28″ at OSM node n389014402, and there 326 km of total upstream flows in. load it's distributaries

(unnamed) has 2 tributaries.

• Cwm Camlais-fach, which joins it at N 51° 56′ 15″, W 3° 31′ 11″ at OSM node n389014845, and 3 km of total upstream flows in.
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• Nant y Llest, which joins it at N 51° 55′ 5″, W 3° 31′ 2″ at OSM node n389012683, and 3 km of total upstream flows in.
load it's tributaries